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I am trying to connect a USB relay to actuator, so when I press button 1 , motor goes up, when i press button 2, polarity is switched and motor goes down.

I am trying to achieve this with a DPDT relay. Someone gave me this diagram, however, when i press button 1 motor goes down, but nothing happens when I press button 2. What did I miss ?

enter image description here

Useful info : Actuator = Motor, connecting 2 at the same time so they both run together

USB Board = USB Relay, but has physical buttons. I have a 4 channel relay, only 2 are used. When I Press button 1 in front of channel 1, motor should go forward, when I press button 2 in front of channel 2, polarity should reverse, thus motor moving backward.

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    \$\begingroup\$ There's a schematic button on the editor toolbar. It has symbols for switches and relays. It will produce a legible schematic and by the time you have finished drawing it neatly you might spot your problem. \$\endgroup\$
    – Transistor
    Apr 20 at 19:08
  • \$\begingroup\$ Forgive me I have very little electrical knowledge - i couldn't figure out using the tools, that was the best I could do \$\endgroup\$
    – S.Jess
    Apr 20 at 19:14
  • \$\begingroup\$ I really can’t figure out that diagram, but if you have two SPDT relays independently controlled that is enough for forward/reverse/stop control. \$\endgroup\$ Apr 20 at 19:20
  • \$\begingroup\$ (1) What is "actuator"? (2) Why does your diagram have two actuators? (3) Why have you two relays on the USB board and a DPDT relay as well? (4) "when i press button 1 ..." Where are buttons 1 and 2? (5) "nothing happens when I press button 2." Nothing? No relay click or LED on the USB board? Please edit your question to supply all the missing information. Don't bury essential information in the comments. \$\endgroup\$
    – Transistor
    Apr 20 at 19:23
  • \$\begingroup\$ Thank you for the comment. I have updated the post \$\endgroup\$
    – S.Jess
    Apr 20 at 19:37
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schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. All you need.

How it works:

  • With RLY1 and RLY2 de-energised both ends of the actuator motors are connected to negative. They won't move.
  • With RLY1 and RLY2 energised both ends of the actuator motors are connected to positive. They won't move.
  • If only RLY1 is energised it supplies the positive connection and RLY2 supplies the negative. The motors will run forwards.
  • If only RLY2 is energised it supplies the positive connection and RLY1 supplies the negative. The motors will run backwards.
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  • \$\begingroup\$ Very grateful for your reply ! So there is no need for the DPDT rely at all, I would just use the relay on the USB Rely board ? \$\endgroup\$
    – S.Jess
    Apr 20 at 20:08
  • \$\begingroup\$ I've updated with a schematic for each state. Read through the answer again to make sure you understand it. Can you think of any reason that it wouldn't do what you want? Don't forget to accept the answer if it answers your question to your satisfaction. \$\endgroup\$
    – Transistor
    Apr 20 at 20:39
  • \$\begingroup\$ Works like a charm! Thanks \$\endgroup\$
    – S.Jess
    Apr 29 at 23:46
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enter image description here

You can do it with just the USB relay board

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